[GHC] #11650: Documentation does not mention that default definitions for Alternative(some, many) can easily blow up

[GHC]

#11650: Documentation does not mention that default definitions for
Alternative(some, many) can easily blow up
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Documentation     |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 OK. I noticed that `U1` is also missing a `MonadPlus` instance as well, so
 we can scoop up all the missing `U1`/`Proxy` instances in another patch.

 So now that question remains: do we fix `U1`'s `Alternative` instance by
 overriding `some`/`many`, or do we fix it by making `<*>` lazier? I'm
 inclined to pick the former, since `U1` is almost always used in the
 context of GHC generics, and strictly pattern-matching on it is almost
 always what you intend to do.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11650#comment:7>
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